Question
Which generator in wind turbines uses slip rings and a partially rated converter for variable-speed operation?
The correct answer is
doubly-fed induction generator
The Doubly-Fed Induction Generator (DFIG):
- Stator is directly connected to the grid.
- Rotor is connected via slip rings to a partially-rated (30%) back-to-back converter.
- Enables variable-speed operation over a wide range (typically ±30% of synchronous speed).
- Most widely used in modern large wind turbines due to cost-effectiveness.
Squirrel cage: constant speed (no slip rings). Permanent magnet: full-rated converter, no slip rings. Brushless DC: not used in wind turbines.
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Important Questions from Types of Induction Motor
A squirrel cage induction motor requires _______ maintenance as compared to a slip ring induction motor.
The stators of which of the following motors is similar?
- Which type of motor will work as single excited motor?
Which of following statements is true for a slip ring induction motor?
Why is the rotor bar of the squirrel cage rotor permanently short-circuited at the ends?
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